Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dffd1a789bdbc64…

MALICIOUS

PDF

75.2 KB Created: 2021-09-09 15:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8203d3fd80526d55a7f2358cacee52b8 SHA-1: 94376b4750abe88c1db407dd6abcc6465f8f5afc SHA-256: 1dffd1a789bdbc64af9188829fc1e17b2c7c3d212ac088b9f258279ec0a6aeb2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript. This JavaScript likely facilitates the redirection to external URLs, as evidenced by the numerous extracted URLs, some of which are hosted on potentially disposable domains. The primary purpose appears to be directing users to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://duda-tech.pl/dudatech/upload/file/19861733005.pdf In PDF document text
    • https://episcopiaoradiei.ro/files/xiwilinedaxewe.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/6f0bd25f495e09d54865177f3acd01c3/10301698078.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/24989724901.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/49068663079.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/76400905997.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5da16434---81187324834.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/9874068524.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/23849607493.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/46061913465.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/nipovikelapepani.pdfIn PDF document text
    • https://service-panev.com/userfiles/93084113026.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/85615278694.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/nagemipatunad.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109051809093154.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/36612244545.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/nejiwatimukiget.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/15bulj3oocdkpnti4knpf442r3/49055721432.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/zegelo.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/kenidaneboxoweworefuta.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/wuvivid.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/95708725527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=thea+stilton+books+the+mysterious+love+letter+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEE 17304 bytes
SHA-256: c3a1997d93de9198188c5458726463ac137da63824535d936e3114ef51d7d47d
font_01_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 11240 bytes
SHA-256: f9943a1cd00b9d17183430a13a55d05c1e44b14263f12f065611e83be0186c7b
font_02_sfnt_off0001068e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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